Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9753c7a6136b43f…

MALICIOUS

PDF

138.2 KB Created: 2021-06-28 03:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c4c1d6739c8cbbee36ec05836c0c71a SHA-1: 7c710b1defbffb125f14396f7c2eeb8540d9ef8a SHA-256: d9753c7a6136b43f87f9c3a6dc5154ed7ddbad457318397336a7c70b00f913ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role as a link farm for potentially malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=district+15+brooklyn+middle+schools PDF link annotation
    • http://yuemeism.com/uploadfiles/files/rigafik.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509ae180f6---nemogetofivumelufi.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/dududumefije.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835dae6a455---72466400061.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0e4ba7152ff93728e10030186458cf60/61126708782.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/aqcl3jk31cigpb7fd8c285q9k4/mokijogovarokolibunikix.pdfIn PDF document text
    • http://armanetti.com/images/38682763547.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002b34f3f0---jobepiraduziv.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210619_092257.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/006166lk1pru340pa64ledk9da/zatojotesib.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/210550306179.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/jotefusifibel.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6f91fb0ca4020c4ed5a26326f9480264/95929787861.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f65a345d9---xalegagadupebokawedojo.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062701043270554.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ldh7f7l5o6ujsvgq0980l9u0mh/87082968835.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e7b8321022cae24f24cc8b37a10500df/16090969264.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5631f17d---62199675358.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/73367417223.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/solaferudibekakeloneja.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e62b0086---momiregotexinezilud.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/49110364901.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001babd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BABD 17908 bytes
SHA-256: 700deb6feaa168ad8087cd38b01633ae1214fc5a4c5e1b9414a424aced412ff9
font_01_sfnt_off0001e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9BD 11008 bytes
SHA-256: 12a3b7532ba34f46552c25f7709d5b84a326b1ac121393b7623ea3cf992e1454
font_02_sfnt_off00020341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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